Hi to all,
The scope shows a superimposed high frequency oscillation just on the
negative peaks of the audio signal.
It produces a distorted and annoying audio when the signal peaks, specially
when listening a loud station on the external speaker.
This happens when the volume is close to or at maximum volume. I fails just
with Panasonic RP-HT60 20 Ohm headphones and external 8 ohm speaker (both
work fine with my K2).
It works OK with Panasonic earbud type headphone and with an external 8 Ohm
load !!.
I have re-check every component all around LM386 audio amp: values are OK,
soldering fine.
It doesn't matter if the KX1 is working with external power (7-12 V) or
batteries.
At 12 V the RX current drain is about 35 mA (minimum volume). I raises to 71
mA at maximum volume with the external 8 Ohm resistor, and 75 mA with the
external 8 Ohm speaker.
Hope somebody can help me. Thanks in advance.
73,
Paco Barros
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